• Title/Summary/Keyword: Recycling of PET

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A Study on Characteristics of Flexural Behavior of High-strength Polymer Concrete Beams Using Recycled PET (PET 재활용 고강도 폴리머 콘크리트보의 휨거동에 관한 연구)

  • Cho Byung-Wan;Park Jong-Hwa;Park Seung-Kook;Bea Sung-Wan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.483-486
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    • 2005
  • The polymer concrete is drawing a strong interest as high-performance materials in the construction industry. Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems posed by plastics and save energy. Polymer concrete beams using unsaturated polyester resins based on recycled polyethylene terephthalate (PET) plastic waste were used in our study for grasping its structural behavior of static and fatigue. As a result of static test, Compression stress distribution of Polymer concrete indicates linear behavior such as triangles. Although polymer concrete is high strength materials, its ductility capacity is excellent. From the fatigue test results, There was almost no difference on flexural characteristics between before and after fatigue loading. Therefore, recycled PET polymer concrete remains excellent structural ability after fatigue loading.

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Triboelectrostatic Separation of Mixed Three Kinds of Plastics by a Two-stage Separation Process (2단계(段階) 분리공정(分離工程)에 의한 3종(種) 혼합(混合)플라스틱의 마찰하전(摩擦荷電) 정전선별(靜電選別))

  • Park, Chul-Hyun;Jeon, Ho-Seok;Baek, Sang-Ho;Park, Jai-Koo
    • Resources Recycling
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    • v.16 no.5
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    • pp.57-64
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    • 2007
  • Triboelectrostatic separation of mixed three kinds of plastics, PVC, PET and PMMA, in the range of similar gravity has been performed through a two-stage separation process. Polypropylene (PP) and high-impact polystyrene (HIPS) were found to be the most effective materials for a tribo-charger in the separation of PVC, PET and PMMA. In the 1st stage using the PP cyclone charger, PVC grade and recovery depended considerably on the air velocity (10 m/s), the relative humidity (<30%), the electric field (>200 kV/m) and the splitter position (+2 cm from the center) in the triboelelctrostatic separator unit. At an optimum condition a PVC grade of 99.6% and a recovery of 97.5% was achieved. In the 2nd stage using the HIPS cyclone charger, a PMMA grade of 98.3% and a recovery of 97.0% was obtained under the conditions of 10m/s air velocity, over 250 kV/m electric field, central splitter position and less than 40% relative humidity.

Mechanical properties of sustainable green self-compacting concrete incorporating recycled waste PET: A state-of-the-art review

  • Shireen T. Saadullah;James H. Haido;Yaman S.S. Al-Kamaki
    • Advances in concrete construction
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    • v.16 no.1
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    • pp.35-57
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    • 2023
  • Majority of the plastic produced each year is being disposed in land after single-use, which becomes waste and takes up a lot of storage space. Therefore, there is an urgent need to find alternative solutions instead of disposal. Recycling and reusing the PET plastic waste as aggregate replacement and fiber in concrete production can be one of the eco- friendly methods as there is a great demand for concrete around the world, especially in developing countries by raising human awareness of the environment, the economy, and Carbon dioxide (CO2) emissions. Self-compacting concrete (SCC) is a key development in concrete technology that offers a number of attractive features over traditional concrete applications. Recently, in order to improve its durability and prevent such plastics from directly contacting the environment, various kinds of plastics have been added. This review article summarizes the latest evident on the performance of SCC containing recycled PET as eco-friendly aggregates and fiber. Moreover, it highlights the influence of substitution content, shape, length, and size on the fresh and properties of SCC incorporating PET plastic. Based on the findings of the articles that were reviewed for this study, it is observed that SCC made of PET plastic (PETSCC) can be employed in construction era owing to its acceptable mechanical and fresh properties. On the other hand, it is concluded that owing to the lightweight nature of plastic aggregate, Reusing PET waste in the construction application is an effective approach to reduces the earthquake risk of a building.

Strength and Crack Resistance Properties of Fiber Reinforced Concrete Mixed with Recycled PET Fiber (재생 PET 섬유가 혼입된 섬유 보강 콘크리트의 강도 및 균열저항 특성)

  • Kim, Sung-Bae;Kim, Hyun-Young;Yi, Na-Hyun;Kim, Jang-Ho Jay
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.1
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    • pp.102-108
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    • 2010
  • The main objective of this study was to evaluate the effect of recycled PET (RPET) fiber made from waste PET bottles to examine application on concrete member. To evaluate the reinforcement effect of RPET fiber in concrete member, experimental tests were performed, such as mechanical property tests (compressive strength, modulus of elasticity and splitting tensile strength) and drying shrinkage test. In mechanical property tests, compressive strength and modulus of elasticity in concrete mixed with RPET fiber gradually decreased, but splitting tensile strength gradually increased as volume fraction of fiber increased. In drying shrinkage test, free drying shrinkage increased. In restrained case, in contrast, crack occurrence was delayed because of tensile resistance increase by RPET fiber. The comparison of RPET and PP fiber added concrete specimen's properties showed that two materials had similar properties. In conclusion, RPET fiber is an alternative material of PP fiber, even finer for its excellence in eco-friendliness due to the recycling of waste PET bottles and its possible contribution to the pollution declination.

Separation of wasted plastics by thermal adhesion (열 점착을 이용한 혼합 폐 플라스틱의 선택적 분리)

  • Lim Seok ki;Cho Hee chan
    • Resources Recycling
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    • v.12 no.4
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    • pp.44-50
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    • 2003
  • Separation of mixed plastics is not a simple task due to similarities of specific gravity and limitations of sizes, etc. In this study, a new technique was developed to separate plastics selectively by a thermal adhesion method using the different softening or melting temperatures of various types of plastics. Tests were conducted to investigate softening or melting temperatures and adhesion probabilities of plastics with change in temperature. Tests also were conducted to analyze the operating variables, including contact times, size and color pigment. It was founded that LDPE, HDPE and PVC, PET, etc among mixed plastics could be separated selectively according to the change of temperature.

Separation of PET and PVC by Flotation

  • Owada, Shuji;Yamamoto, Mika;Kanazaki, Motohiko
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.730-733
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    • 2001
  • Separation of PET and PVC is a key technology to achieve effective plastics recycling but no efficient and economically feasible method has been developed yet. The application of flotation was investigated by many researchers but the causes of the selectivity were not clarified. This paper described the adsorption mechanism of wetting agents onto plastics, using the agents which have various polarity and hydrocarbon chain length. It was found that (1) hydrophobic interaction played a predominant role for the adsorption, (2) anionic wetting agents could be adsorbed onto negatively charged plastics with the polar radicals oriented outer part of the plastics, then often depressed plastics more effectively than cationic agents, and (3) PET and PVC could be separated with dodecyamine hydrochloride and sodium dodecyl- sulfonate in the concentration ranges of 1.0$\times$10$^{[-10]}$ $^{6}$ -5.0$\times$10$^{[-10]}$ $^{5}$ and 2.0$\times$10$^{[-10]}$ $^{6}$ -1.0$\times$10$^{[-10]}$ $^{5}$ mo1/1, respectively.

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A Proposal of Stress-Strain Relations Model for Recycled-PET Polymer Concrete under Uniaxial Stress (일축 하중을 받는 PET 재활용 폴리머콘크리트의 응력-변형률 모델의 제안)

  • Jo Byung-Wan;Moon Rin-Gon;Park Seung-Kook
    • Journal of the Korea Concrete Institute
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    • v.16 no.6 s.84
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    • pp.767-776
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    • 2004
  • Polymer concrete shows excellent mechanical properties and chemical resistance compared with conventional normal cement concrete. The polymer concrete is drawing a strong interest as high-performance materials in the construction industry. Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems posed by plastics and save energy. The purposed of this paper is to propose the model for the stress-strain relation of recycled-PET polymer concrete at monotonic uniaxial compression and is to investigate for the stress-strain behavior characteristics of recycled-PET polymer concrete with different variables(strength, resin contents, curing conditions, addition of silane and ages). The maximum stress and strain of recycled-PET polymer concrete was found to increase with an increase in resin content, however, it decreased beyond a particular level of resin content. A ascending and descending branch of stress-strain curve represented more sharply at high temperature curing more than normal temperature curing. Addition of silane increases compressive strength and postpeak ductility. In addition, results show that the proposed model accurately predicts the stress-strain relation of recycled-PET polymer concrete

Strength Characteristics on Sulfuric Acid Corrosion of Recycled PET Polymer Concrete with Different Fillers (충전재 종류에 따른 PET재활용 폴리머콘크리트의 황산부식에 대한 강도 특성)

  • Jo Byung-Wan;Shin Kyung-Chul;Park Seung-Kook
    • Journal of the Korea Concrete Institute
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    • v.17 no.4 s.88
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    • pp.499-504
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    • 2005
  • Polymer concrete shows excellent mechanical properties and chemical resistance compared with conventional normal cement concrete. The polymer concrete Is drawing a strong interest as high-performance materials in the construction industry Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems Posed by plastics and save energy. An objective of this paper is to estimate the damage of sulfuric acid, through investigating recycled PET polymer concrete, immersed at sulfuric acid solution for 84 days. As a result of testing, recycled PET PC, used $CaCO_3$ as filler, makes a problem of appearance and strength if they are exposed for long term at corrosion environment. On the other hand, recycled PET PC, used fly-ash as filler, had less effect on decrease in weight and strength. Recycled PET PC is excellent chemical resistance, resulting in the role of unsaturated polyester resin which consists of polymer chain structure accomplishes bond of aggregates and filler strongly. Also, recycled PET PC, used fly-ash as filler, is stronger resistance of sulfuric acid corrosion than $CaCO_3$, because it is composed of $SiO_2$ and very strong glassy crystal structure. Therefore, recycled PET PC, used fly-ash as filler, is available under corrosion circumstances like sewer pipe or waste disposal plant.

Development of Tribo-electrostatic Separation Technique for Scale-up Process of Heavy Group Plastic Tailings (고비중(高比重) 종말품(終末品) 폐(廢)플라스틱 대량처리(大量處理)를 위한 마찰하전(摩擦荷電) 정전선별(靜電選別) 기술개발(技術開發))

  • Park, Chul-Hyun;Jeon, Ho-Seok;Baek, Sang-Ho;Kim, Bong-Gon
    • Resources Recycling
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    • v.18 no.2
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    • pp.30-38
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    • 2009
  • In this research, we studied the scale-up triboelectrostatic process for separation of PVC from higher gravity fraction of plastic wastes produced from wet gravity separation process. High density polyethylene (HDPE) was found to be the most effective materials for a tribo-charger in the separation of plastic tailings. In a commercial scale triboelelctrostatic separator unit, using the HDPE pipe-line charger, a grade of 99.1% with PET, PS and others and a recovery of 86% was obtained under optimum conditions at over 250 kV/m electric field, a splitter position of -8 cm from the center, and less than 40% relative humidity. The developed unit can process the plastic wastes at a 300 kg/h, and the product can be utilized as RPF or RDF of over grade 2.